1/*
2%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3%                                                                             %
4%                                                                             %
5%                                                                             %
6%                            DDDD    OOO   TTTTT                              %
7%                            D   D  O   O    T                                %
8%                            D   D  O   O    T                                %
9%                            D   D  O   O    T                                %
10%                            DDDD    OOO     T                                %
11%                                                                             %
12%                                                                             %
13%                      Read/Write Graphviz DOT Format                         %
14%                                                                             %
15%                              Software Design                                %
16%                                   Cristy                                    %
17%                                 July 1992                                   %
18%                                                                             %
19%                                                                             %
20%  Copyright 1999-2016 ImageMagick Studio LLC, a non-profit organization      %
21%  dedicated to making software imaging solutions freely available.           %
22%                                                                             %
23%  You may not use this file except in compliance with the License.  You may  %
24%  obtain a copy of the License at                                            %
25%                                                                             %
26%    http://www.imagemagick.org/script/license.php                            %
27%                                                                             %
28%  Unless required by applicable law or agreed to in writing, software        %
29%  distributed under the License is distributed on an "AS IS" BASIS,          %
30%  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
31%  See the License for the specific language governing permissions and        %
32%  limitations under the License.                                             %
33%                                                                             %
34%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
35%
36%
37*/
38
39/*
40  Include declarations.
41*/
42#include "MagickCore/studio.h"
43#include "MagickCore/blob.h"
44#include "MagickCore/blob-private.h"
45#include "MagickCore/client.h"
46#include "MagickCore/constitute.h"
47#include "MagickCore/exception.h"
48#include "MagickCore/exception-private.h"
49#include "MagickCore/image.h"
50#include "MagickCore/image-private.h"
51#include "MagickCore/list.h"
52#include "MagickCore/magick.h"
53#include "MagickCore/memory_.h"
54#include "MagickCore/monitor.h"
55#include "MagickCore/monitor-private.h"
56#include "MagickCore/option.h"
57#include "MagickCore/resource_.h"
58#include "MagickCore/quantum-private.h"
59#include "MagickCore/static.h"
60#include "MagickCore/string_.h"
61#include "MagickCore/module.h"
62#include "MagickCore/utility.h"
63#include "MagickCore/xwindow-private.h"
64#if defined(MAGICKCORE_GVC_DELEGATE)
65#undef HAVE_CONFIG_H
66#include <gvc.h>
67static GVC_t
68  *graphic_context = (GVC_t *) NULL;
69#endif
70
71#if defined(MAGICKCORE_GVC_DELEGATE)
72/*
73%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
74%                                                                             %
75%                                                                             %
76%                                                                             %
77%   R e a d D O T I m a g e                                                   %
78%                                                                             %
79%                                                                             %
80%                                                                             %
81%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
82%
83%  ReadDOTImage() reads a Graphviz image file and returns it.  It allocates
84%  the memory necessary for the new Image structure and returns a pointer to
85%  the new image.
86%
87%  The format of the ReadDOTImage method is:
88%
89%      Image *ReadDOTImage(const ImageInfo *image_info,ExceptionInfo *exception)
90%
91%  A description of each parameter follows:
92%
93%    o image_info: the image info.
94%
95%    o exception: return any errors or warnings in this structure.
96%
97*/
98static Image *ReadDOTImage(const ImageInfo *image_info,ExceptionInfo *exception)
99{
100  char
101    command[MagickPathExtent];
102
103  const char
104    *option;
105
106  graph_t
107    *graph;
108
109  Image
110    *image;
111
112  ImageInfo
113    *read_info;
114
115  MagickBooleanType
116    status;
117
118  /*
119    Open image file.
120  */
121  assert(image_info != (const ImageInfo *) NULL);
122  assert(image_info->signature == MagickCoreSignature);
123  if (image_info->debug != MagickFalse)
124    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
125      image_info->filename);
126  assert(exception != (ExceptionInfo *) NULL);
127  assert(exception->signature == MagickCoreSignature);
128  assert(graphic_context != (GVC_t *) NULL);
129  image=AcquireImage(image_info,exception);
130  status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
131  if (status == MagickFalse)
132    return((Image *) NULL);
133  read_info=CloneImageInfo(image_info);
134  SetImageInfoBlob(read_info,(void *) NULL,0);
135  (void) CopyMagickString(read_info->magick,"SVG",MagickPathExtent);
136  (void) AcquireUniqueFilename(read_info->filename);
137  (void) FormatLocaleString(command,MagickPathExtent,"-Tsvg -o%s %s",
138    read_info->filename,image_info->filename);
139#if !defined(WITH_CGRAPH)
140  graph=agread(GetBlobFileHandle(image));
141#else
142  graph=agread(GetBlobFileHandle(image),(Agdisc_t *) NULL);
143#endif
144  if (graph == (graph_t *) NULL)
145    {
146      (void) RelinquishUniqueFileResource(read_info->filename);
147      return ((Image *) NULL);
148    }
149  option=GetImageOption(image_info,"dot:layout-engine");
150  if (option == (const char *) NULL)
151    gvLayout(graphic_context,graph,(char *) "dot");
152  else
153    gvLayout(graphic_context,graph,(char *) option);
154  gvRenderFilename(graphic_context,graph,(char *) "svg",read_info->filename);
155  gvFreeLayout(graphic_context,graph);
156  agclose(graph);
157  /*
158    Read SVG graph.
159  */
160  image=ReadImage(read_info,exception);
161  (void) RelinquishUniqueFileResource(read_info->filename);
162  read_info=DestroyImageInfo(read_info);
163  if (image == (Image *) NULL)
164    return((Image *) NULL);
165  return(GetFirstImageInList(image));
166}
167#endif
168
169/*
170%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
171%                                                                             %
172%                                                                             %
173%                                                                             %
174%   R e g i s t e r D O T I m a g e                                           %
175%                                                                             %
176%                                                                             %
177%                                                                             %
178%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
179%
180%  RegisterDOTImage() adds attributes for the Display Postscript image
181%  format to the list of supported formats.  The attributes include the image
182%  format tag, a method to read and/or write the format, whether the format
183%  supports the saving of more than one frame to the same file or blob,
184%  whether the format supports native in-memory I/O, and a brief
185%  description of the format.
186%
187%  The format of the RegisterDOTImage method is:
188%
189%      size_t RegisterDOTImage(void)
190%
191*/
192ModuleExport size_t RegisterDOTImage(void)
193{
194  MagickInfo
195    *entry;
196
197  entry=AcquireMagickInfo("DOT","DOT","Graphviz");
198#if defined(MAGICKCORE_GVC_DELEGATE)
199  entry->decoder=(DecodeImageHandler *) ReadDOTImage;
200#endif
201  entry->flags^=CoderBlobSupportFlag;
202  (void) RegisterMagickInfo(entry);
203  entry=AcquireMagickInfo("DOT","GV","Graphviz");
204#if defined(MAGICKCORE_GVC_DELEGATE)
205  entry->decoder=(DecodeImageHandler *) ReadDOTImage;
206#endif
207  entry->flags^=CoderBlobSupportFlag;
208  (void) RegisterMagickInfo(entry);
209#if defined(MAGICKCORE_GVC_DELEGATE)
210  graphic_context=gvContext();
211#endif
212  return(MagickImageCoderSignature);
213}
214
215/*
216%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
217%                                                                             %
218%                                                                             %
219%                                                                             %
220%   U n r e g i s t e r D O T I m a g e                                       %
221%                                                                             %
222%                                                                             %
223%                                                                             %
224%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
225%
226%  UnregisterDOTImage() removes format registrations made by the
227%  DOT module from the list of supported formats.
228%
229%  The format of the UnregisterDOTImage method is:
230%
231%      UnregisterDOTImage(void)
232%
233*/
234ModuleExport void UnregisterDOTImage(void)
235{
236  (void) UnregisterMagickInfo("GV");
237  (void) UnregisterMagickInfo("DOT");
238#if defined(MAGICKCORE_GVC_DELEGATE)
239  if (graphic_context != (GVC_t *) NULL)
240    {
241      gvFreeContext(graphic_context);
242      graphic_context=(GVC_t *) NULL;
243    }
244#endif
245}
246